book Maths Puzzle Numerical Ability

I really need help with this question... the point (0,1) has the distance ? from the line defined by {{{y=-2x-1}}}

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solve: 1/e^-x^2=(e^3x)*1/e^2 Ashley needs a mixture of 74% oats and 26% corn. She currently has 26 pounds of a mixture of 23% oats. How many pounds of oats should be added to the mixture?